Feeding mechanism for sewing-machines.



A. H. DE VOE.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION HLED OCT-8.1913- Patented Apr. 245, 191?.

2 sIIEETs-sIIE'ET I.

A. H. DE VOE'.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED OCT. 8, I9I3.

ggg mm, I. Patented A r.-24,1917.

2 SHEETS-SHEET 2.

2 Q2 ATTORlI/EV button feeding mechanism such as thatv ZED er caries.

ALBERT H. DE VOE, 0F WESTFIELD, NEW J ERSEY ASSIGNOB TO THE SINGER MANU-FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING- MECHANISM FOR SEWING-MACHINES.

Patented Apr. 24, 1 917. October 8,

1 ,223 51%} Specification of Letters Patent.

Original application filed May 16, 1913, Serial No. 767,963. Divided andthisapplication filed 1913. Serial No. 794,029.

Fig. 4 is a sectional elevation of the control- To all'wkomz't mayconcern:

Be it known that I, ALBERT H. DE Von, a ling cam and connected parts andFig. 5 1s citizen of the United States, residing at a perspective viewof said cam detached. lVestfield, in the county of Union and State Fig.6 is an elevation, in transverse section of New Jersey, have inventedcertain new of the two part feed-dog. Fig. 7 is a perspective view of afabric-flap provided with fasteners or buttons secured thereto.

As represented in the drawings the feeding mechanism is shown applied toa machine constructed with the bed-plate 1, the hollow standardbracket-arm 3 in which is journaled the main-shaft 4 carrying at itsrearward end balance-wheel 5 and belt-pulley 6. I

J ournaled in the head of the bracket-arm is the tubular needle-bar 7 onthe upper end of which is secured by clamp screws 8 the split collar 9carrying a lateral stud which is embraced by the lower end of pitman 10the opposite apertured end of which embraces cra -pin 11 of crank disk12 upon pending applicathe main-shaft 4.

The needle-bar carries at 1ts lower end a bracket 13 formed with thetransverse slideway 14 in which is fitted a needle carrying slide-block15. The slide-block is formed with a lateral forked arm adapted toembrace roller-stud 16 carried by a lateral arm upon the lower end of anoscillatory bar fitted within a chamber formed in the needlebar andconnected to rod 17, the latter being journaled within the split collar9. The rod 17 is journaled in the upper part of the 3 and is keyed tothe spaced whereby and useful Improvements in Feeding Mechanism forSewing-Machines, of which the following is a specification, referencebeing bad therein to the accompanying drawings.

This invention has for its primary object to provide a sewing machinewith feeding mechanism and controlling means therefor whereby saidfeeding mechanism is adapted to impart to the work interrupted seriesof' uniform work-advancing movements, the feeding movements of eachseries difiering in number and in length from those of the adjacentseries." The feeding mechanism is adapted more especially for use inconnection with stitch-forming mechanism and forming the subject of mytion, Serial No. 767,963, filed May 16, 1913, of which the presentapplication is a ivision. In the aforesaid pending application aconstruction is provided for stitching on that class ofmetallicfasteners or buttons commonly attached to one of the overlappingheel flaps of a cloth shoe upper or J apanese tabi for introductionwithin a cor loop secured upon the other flap. 'The said metallicbuttons or fasteners are provided at one end with transverse aperturesand sai fasteners are secured to the fabric by spaced f tacking stitchesextending over groups 0 their opposite edges and into the adjacent h j1S P rm tied to reciprocate freely apertures and are ;connected by a fewW h n but to p r a f the rocking movestraight-away fastening stitches,the tacking 'm n s Of th bra k Bracket 18 is constitches between thefasteners being con- I y P m n 20 t0 rocking-yoke l9,

nected by series of straight-away stitches ex. the latter bemg actuatedby cam 72 to 1mceeding in number that of the straight-away part oggingmovements to the needle, as fastening stitches and adapted to b ifullydescribed in my aforesaid application. creased or decreased inlength to vary the To he {H ll af 1 9I I1e ted sh11ttle acspacing apartof the metallic fasteners. tuating pltman 21 and lntermedlate rockerMeans are provided for adjusting the pri- 22 upon the rearward end of ashuttle actumary stitch length in addition to that for ating rock-shaft23 havmg upon ts o pochanging the relative lengths of the fastensite enda shuttle (lI'lVGI for impartmg osciling and the spacing straight-awaystitches. latory movements to a shuttle mounted with- In theaccompanying drawings, Figure 1 in the race 24 and adapte to cooperatewith the needle in the production of stitches. The -main shaft hassecured thereon adjacent the actuating crank 25 the usual feed actuatingand feed lift eccentric 26 and 27 the eccentric 26 being embraced by astrap 28 pro= is a perspective view of the feeding and needlemechanisms. Fig. 2 is a rear side view artly in section of a sewingmachine embodying the present improvements, and F] g. 3 is a plan of thesame partly in section.

2 and the overhanging" vided with channeled bearing lugs 29 embraced bythe fork 30 at the upper end of the link bar 31 whose lower end isadjustably connected, by means of the bolt 32 passing thro'ughthe slot33 within the lateral arm 34, to the feed rock-shaft 35 having the usualbearing lugs 36 carrying centerscrews for the cross member 37 of thefeedbar 38 which is formed at its opposite end with the fork 39. -Fork39 is entered by the usual roller-stud 40 carried by thelateral arm 41of feed-lift rock shaft 42 having at its opposite end connections withpitman 43 actuated by feed-lift eccentric 27 to which the pltman isconnected by strap 28'.

The feed-bar 38 has secured thereon the primary feed-dog section uhaving secured thereon .by means of screw a a rectangular spring pressedauxiliary feed-dog section b. The link-bar 31 carries at its fork 30 thestud-screw 42 bracing the apertured upper end of 'the link 44whose'lower end embraces the fulcrum stud 45 carried by the dependingarm 46 whose split hub 47 is secured by means of the clamp-screw 48 uponthe rock-shaft 49 which is journaled in a suitable bearing providedtherefor in the bracket arm and carries at its opposite end thedepending crank-arm 50. carries a stud 51 embraced by one end of thesplit-link 52 whose opposite end embraces a stud carried by lateral arm53 of a rocking feed-regulator frame having the hub 54 secured by theset-screw 55 upon the structedwith a depending member 61 from whichextends the lateral 'arm or lever 62 carrying upon its upper face theroller 63. The lever 62 has at its outer extremity the downwardly offsetlateral lug 62' in which is mounted the fulcrum screw 64 of the lever 5carrying upon its upper face the roller stud 66 and having near itsopposite end an enlargement containing the segmental transverse-slot 67and terminating in the fingerpiece 68. The lever is secured adjustablyupon the lever 62 by means of the clampscrew 69 whose shank passesthrough the slot 67 and is tapped into the lever 62.

As represented in the drawings the roller studs 63 and 66 are arrangedat different levels, and in register with the peripheral roller-studscam-tracks 70 and 71 journaled upon the 73 (Fig. 4) of a bracket 74whose foot 75 is secured by screws 76 to a depending flange 77 of thebracket arm member 3. The 63 and 66 are maintained in operative relationwith the cam 72 by means of a spring 78 surrounding the upper portion ofrock-shaft 60 and having one extremity engaged by fixed stud 79'and theother extremity in the collar 80 secured by'set-screw 80 I upon theupper end of the rock-shaft 60.

ture in the disk lower end of rock-shaft 60 and con of a cam cylinder 72tubular bearing boss confined within an aperture The upperend of thecam-cylinder 72 is formed with a cam-groove 72 g-yoke 19 by means ofwhich lateral jogging movements are imparted to the needle through theconnections hereinbefore described.

Secured upon the main-shaft 4 is the worm- 82 meshing with theworm-wheel 83 which is secured by means of the set-screw 84' upon theupper end of the cam-wheel shaft 85 journaled within the bore of thetubular bearing boss 73. 'As shownand described in my pendingapplication Serial N 0. 718,807, the shaft 85 has upon its lower end adisk 86 formed in its lower face with the radial channel 87. Fitted tothe side walls of the channel 87 by means of the clamp-nut 90-upon thereduced threaded lower end of the plungerpin 92 which is fitted withinan axial socket formed in the shaft 85 and pressed downwardly by meansof the spring 93. The arm 89 carries an upwardly extending coupling-pin94 which passes through an aper- 86 and is adapted to enter any one of acircular series of holes 95 in the lower end of the cam 72 fordetachably securing the latter to the constantly rotating shaft 85; Thecam cylinder 72, with its cam-tracks 70 and 71 and the parts actuated bysaid cam-tracks, thus act as feed changentered by the roller-stud 81 ofthe rockin is an arm 89 secured mg means connected to thefeeding-mechacollar 98 to which is secured one end of a torsion andcompression spring 99 whose opposite end is secured in-the lower bearinglug. A collar 100 is secured upon the upper end of the rock-shaft 97 bymeans of the stud-screw 101, the projecting head of the" latter beingadapted for engagement with the stud-screw 101 tapped into thebracketmember 96 and serving as a'stop to determine the initial axialposition of the rockshaft. Secured at the lower end of the rockshaft 97is the hub of the laterally extendinglatch-arm 102 provided at its outerend with a wear-plate 103 serving as a rest for t e lower extremity ofplunger-pin 92.

ounted' upon the fulcrum screwstud 104 is the resser bar liftingrock-lever 105 having upon its rearwardly extending arm the upwardly andlaterally offset lug 106 overhanging theupper end of rock-shaft 97 Therearward arm of this rock-lever is pivotallyjconnected to a rod 107which is adaptw ed in practice tobe actuated by means of a knee-lever ortreadle to tilt the rock-lever;

105 able rock-shaft 97 having secured thereon a Y Preparatory to abutton-stitching operation the coupling arm 102 is in its retractedposition with the pin 94: disengaged from the cam-cylinder 72 and oneedge of the wearplate disposed at the side of the plunger-pin 92, itbeing maintained in such position by the spring 99. Operation of therock-lever 105 causes the lifting of the presser-foot and the engagementof lug 106 with the end of rock-shaft 97 which causes the lowering ofthe arm 102 below the end of the plunger-pin 92 thereby permitting thewear-plate 103, under the action of the spring 99, to assume a positionbeneath the plunger-pin; and the subsequent release of the lever 105permits the rock-shaft 97 to rise under the action of the spring 99thereby forcing upwardly the plunger-pin 92 in opposition to its weakerspring 93 and causing the coupling-pin 91 to enter the first of thecam-wheel apertures 95 which it thereafter encounters, whereby thecam-wheel is driven positively.

()n setting the machine in motion the high portion 71 of the cam trackacts upon rollerstud (36' and shifts the rocking feed regulator framefrom the position shown in Fig. 1 to elevate fulcrum 15 of link-bar 31and enable eccentric 28 to impart rising and falling movements to thelink-bar, whereby work feeding-movements are produced to form a fewinitial straight-away stitches s (Fig. 7).

During the formation of said stitches, the

button feeding mechanism described in my pending application Serial No.767,963, is actuated to move metallic button B into register with thestitch-forming mechanism, whereupon the cam discontinues its action uponroller-stud 66 and link-bar 31 swings idly in the position shown in Fig.1, the fe ding movements being interrupted and the needle performing itsjogging movements to produce the first group of tacking stitches tacross the edge of the button.

After the formation of tacking-stitches t, the high portion 7 0 of camtrack acts upon roller-stud 63 to again throw the feed-dog into actionduring the formation of fastening straight-away stitches s and the firstof the succeeding group of tacking stitches, whereupon the operativemovements of the feed-dog are suspended for the second period of needleoggmg movements to form the remaining tacking stitches over the edge ofthe button.

At the completion of the second tack t, the high portion 71 of thecam-track 71 again shifts the rocking feed-regulator frame forproduction of the "spacing-stitch work feeding movements, the length ofsuch feeding movements being determined by the position of adjustment ofthe lever 65 upon the arm 62. and hence the distance of the roller-stud66 from the lower portion or that ofthe least curvature of the cam-track71.

The cam-track 7 0 is shown provided with an .arm 108 and arm auxiliaryhigh portion 70 to slightly supplement the action of cam portion 71 ofcam track 71 so as to insure the arrest of the work feeding mechanism atprecisely the proper time, regardless of the position of rollerstud 66which may in practice slightly disturb the timing of the suspension offeed. This arrest of the work feeding mechanism occurs when the roller63 rides off the auxiliary high portion 7 0 of the cam-track 7 O.

The length of the primary stitch is adjusted by changing the position oflink-bar bolt 32 within the slot 33 of said feed rock shaft arm 34.

The means for automatically turning the rock shaft 111 to uncouple thecam-cylinder from its actuating shaft at the end of a predeterminedstitching cycle are described in my pending application Serial No.718,807. Such means comprise forked tappet arm 108 carried by rock-shaft97 to embrace a transverse pin 109 carried by a trip-arm 110 securedupon the rook-bar 111, the latter being advanced by means of actuatingpawl 112. Pawl 112 is carried by lateral crankarm 113 upon the upper endof a rockingpin 1141 whose lower end is similarly provided with acrank-arm 115 carrying a rollerstud 116 maintained in contact with theperipheral cam track 117 of the cam-cylinder 72 by means of a spring118. When the bar 111 has advanced sufiiciently to cause the operativeengagement of the trip-arm 110 with the tappet arm 108 of the rockshaft97, the latter is rocked to shift arm 102 laterally, thereby releasingplunger-pin 92 and permitting the same to descend under the action ofspring 93, thus uncoupling .the camcylinder from the continuouslyrotating shaft 97.

When the rock-lever 105 is operated, rockshaft 97 in its descent actsthrough tappet 109 carried by trippingmember 110 to rock the bar 111 andcause stripper-plate 120 carried by said bar to engage upwardlyextending pins 121 carried by the actuating pawl 112 and holding pawl112 to retract the latter, thereby permitting the rack-bar under theaction of spring 119, to return to its initial position, as fullydescribed in my aforesaid pending application.

Having thus set forth the nature of the invention, what I claim hereinis 2- 1. In a sewing machine, in combination, stitch-forming mechanism,feeding mechanism, and feed-controlling means distinct from said feedingmechanism and comprising a cam provided with a plurality of tracks, anda member connected with the feeding mechanism and carrying a pluralityof relatively adjustable followers each adapted for engagement with oneof said cam-tracks.

2. In a sewing machine, in combination,

stitch-forming mechanism, feeding mechanism, and feed-controlling meansdistinct from said feeding mechanism and comprising a cam provided witha plurality of tracks, a primary lever connected with the feedingmechanism and carrying a follower in register with one of saidcam-tracks, and an auxiliary lever mounted upon and ad justablerelatively to the primary lever and carrying a follower in register withanother of said cam-tracks.

3. In a sewing machine, in combination, stitch-forming mechanism,feeding mechanism, and feed-controlling means comprising a cam providedwith a pluralityof tracks, actuating means for said cam, a memberconnected with the feeding mechanism and carrying a plurality ofrelatively ad- 'justable followers each adaptedfor engagement with oneof said cam-tracks, and means for disconnecting said cam from itsactuating means.

4. In a sewing machine, in combination, stitch-forming mechanism,feeding mechanism comprising a feeding element and means whereby itsnormal length of operative movement may be adjusted, and feedcontrollingmeans comprising a cam having a plurality, of tracks, and a memberconnected with an elementof the feeding mechanism and carrying aplurality of relatively adjustable followers each disposed in registerwith one of said cam-tracks.

5. In a sewing machine, in combination, stitch-forming mechanism,feedingmechanism comprislng a feeding member and adnism, feed changingmeans connected to said feeding-mechanism, and automatically actingmeans for suspending the feed changing action of said feed changingmeans for an indefinite period without stopping the machine.

7. In a sewing machine, in combination, stitch-forming mechanism,feeding-mechanism, feed changing means connected to saidfeeding-mechanism, automatically acting means for suspending the feedchanging action of said feed changing means without stopping themachine, and manually operated means for causing said feed changingmeans to resume its feed changing action.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

ALBERT H. DE VOE.

Witnesses:

W. LEE HELMs, LILLIAN M. MILLER.

